Binary up down counter

This video explains the working of a Binary Up/Down counter . The same circuit is used with two interfacing Hex displays alternately
Dr.D.Sarala M.Sc, M.Phil,MBA, D.Litt, PGDCS
Head,Dept.of Physics & Electronics, St.Ann's College, Mehdipatnam,Hyderabad,India
Has been working for the past 35 years teaching Physics, Electronics and Computer Science for the undergraduates. She holds Master's degree in Electronics and Management.